JPH0524567B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an information input/output terminal device, and particularly to a recording/reproducing device suitable for using an optical method.

[Background of the invention]

Conventionally, optical disc master recording cutting equipment with large light sources such as gas lasers has been used, for example, in the 115th SMPTECH Technical Conference and Equipment Exhibition 1974 (``A
Review of tre MCA Disco−Vision
System” 115th SMPTE Technical Conference
and Equipment Exhibit 1974, the optical system as a whole is large;
For precise positioning, it is necessary to reduce the weight of the movable parts and separate the optical system. Since these systems place emphasis on positioning accuracy, access speed is not considered.

[Purpose of the invention]

The purpose of the present invention is to reduce the size and weight of the movable part by separating the optical system into a movable side and a fixed side, thereby shortening the access time and making it relatively easy to make adjustments due to the separation. The purpose of the present invention is to provide a digital information recording and reproducing device.

[Summary of the invention]

If the optical axis of the optical system is misaligned, it may be caused by rotation around each of the three orthogonal x, y, and z axes in the θ _x , θ _y , and θ _z directions, but among these, offset signals are particularly likely to occur in the detection system. x, z, θ It is necessary to make precise adjustments in _{the x} direction.

The present invention separates the optical system into a movable part and a fixed part,
The only movable part is the drive mechanism that corrects focus and track misalignment, making it possible to downsize the optical head and providing an adjustment mechanism to align the optical axes of the movable part and the fixed optical system. This is an optical information recording/reproducing device.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. FIG. 1 is a conceptual diagram of the optical disk device signal detection section. The optical system for writing and reading signals on the disk 1 is separated into a movable optical head 2 and a fixed optical system 6. Movable optical head 2
is supported by a bearing 5 on a rail 18, on which a movable mirror 4 and a movable objective lens 3 are mounted. The fixed optical system 6 includes a light source, a detector, etc., and the light beam 100 emitted from the light source passes through the movable optical head 2, irradiates the disk 1, and passes through the same path to be irradiated by the detector within the fixed optical system 6. Detected. In this configuration, since the optical system is separated into two parts, if the mutual positional relationship deviates, an offset will occur in the detection signal. The adjustment is performed by the adjustment table fixed part 8 and the adjustment table movable part 7. Figure 2 shows the details. The optical system mount 9 is held within the adjustment table movable section 7 by a leaf spring 10 and an adjustment screw 11. Movement in the Z-axis direction is performed by adjusting the adjustment screw 11-d together with the adjustment table movable section 7. Movement in the X-axis direction is performed by an adjustment screw 11-a, rotation around the Z-axis is performed by an adjustment screw 11-b, and rotation around the X-axis is performed by an adjustment screw 11-c. At this time, movement of one axis does not change the attitude of the other axes, so movement of a total of four axes is performed without mutual interference. Therefore, according to this embodiment, since the optical axis can be easily adjusted, the assembly of the optical disk device is simplified.

Another embodiment of the present invention will be described with reference to FIG. In FIG. 3, a prism 12 is newly used to align the optical axes of the fixed optical system and the movable optical head 2. Light lens 1 emitted from semiconductor laser 7
6, prism 15, beam splitter 14, 1/4
The light is emitted through a wave plate 13, and a prism 12 is used to align its optical axis with the optical axis of the movable optical head. According to this, adjustment in the θ _x direction is possible without changing the fixed optical system that has been adjusted, and there is an effect that positioning is facilitated. In addition, FIG. 4 shows the same effect as a prism when a highly viscous fluid 12- is placed between two glass plates 12-a and 12-c.
This is the third embodiment, which was realized by inserting the plate 12-b and moving one of the plates 12-b. FIG. 5 is a partial view showing a fourth embodiment, in which the optical axis can be adjusted by adding a rotation mechanism to the prism 15 on the semiconductor laser 17 side instead of the prism 12 used in the embodiment of FIG. It is something that allows you to do the following.

FIG. 6 shows a fifth embodiment, in which the optical system has a semiconductor laser 17, a lens 16, a beam splitter 14, and a quarter-wave plate 13 on the output side.
By adding a rotation mechanism to the beam splitter 14, the optical axis can be aligned with the movable optical head 2.

〔Effect of the invention〕

According to the present invention, since adjustments can be easily made during assembly, the dimensional accuracy of each component can be made coarse,
Moreover, it is possible to provide a configuration in which the detection signal can be detected with high accuracy. Therefore, there is an effect that the detection signal can be stabilized.

[Brief explanation of the drawing]

Fig. 1 is a side view of the overall configuration, Fig. 2 is a detailed perspective view of the adjustment mechanism shown in Fig. 1, Fig. 3 is a side view of another embodiment, and Fig. 4 is an example of the third embodiment. Enlarged view of section,
FIG. 5 is a partial configuration diagram of the fourth embodiment, and FIG. 6 is a side view of the fifth embodiment. 1... Disk, 2... Movable optical head, 3...
...Movable objective lens, 4...Movable mirror, 5...Bearing, 6...Fixed optical system, 7...Adjustment table movable part,
8...Adjustment table fixing part, 9...Optical system mounting base, 10
...Plate spring, 11 ... Adjustment screw, 12 ... Prism, 13 ... 1/4 wavelength plate, 14 ... Beam splitter, 15 ... Prism, 16 ... Lens, 17
...Semiconductor laser, 18...Rail.

Claims (1)

[Scope of Claims] 1. An optical disc on which information is optically recorded or reproduced, and an optical means for irradiating a light spot onto the optical disc, the first optical means and the second optical disc being arranged apart from each other. 2 optical means, and the first
The optical means has at least a condensing optical system that forms a light spot on the optical disc and is movable in the radial direction of the optical disc, and the second optical system collects the reflected light from the light source and the optical disc. An optical information recording/reproducing apparatus characterized by having an adjustment mechanism for aligning the optical axis of the detector and the first optical system. 2. The optical information recording and reproducing apparatus according to claim 1, wherein the adjustment mechanism includes a plurality of adjustment tables that are independently movable vertically or horizontally. 3. The optical information recording and reproducing apparatus according to item 1, wherein the adjustment mechanism is a prism arranged in the optical path of the emitted light from the second optical system and the reflected light. 4. The optical information recording/reproducing apparatus according to claim 1, wherein the optical axis is adjusted by rotating the adjustment mechanism. 5. The optical information recording/reproducing apparatus according to claim 4, wherein the adjustment mechanism is a beam splitter for separating the emitted light and the reflected light. 6. The optical information recording and reproducing apparatus according to claim 4, wherein the adjustment mechanism is a prism arranged in the optical path of the emitted light.